I have other solution for this. I had for few days lumia 800 sim card slot and it fits ok inside N9, it didn't stands out. So i find out why, inside sim slot there is some kind of spring on left side(touchscreen side), lumia 800 slot is shorter than n9 so it didn't touch this spring. So here is solution

Left leg should be cut off about one milimeter, it's metal so you can't use scissors

Now it didn't stands out, yes I have broken usb door new one is coming from store now.